sheridan



(No Model.) 2 2 Sheets-Sheet 1.

H. B. SHERIDAN.

ELECTRIC LAMP.

No. 259,224. Patented June 6, 1882 v WITNESSES INVENTOR My Q2 t l 2 BY ATTORNEYS.

N PETERS. hcinlllhogrzphor. Washinflon. 11c

(No Model.) 2 Sheets-Sheet 2.

H. B. SHERIDAN.

ELEGTRIG LAMP.

No. 259,224. I Patented June 6,1882.

WITNES s: I v INVENTOR':

fig @y BY Mm 1 ATTORNEYS.

s Photo-hlhugnphlr. wmm mn n c UNITED STATES PATENT Orrion HENRY B. SHERIDAN, OF CLEVELAND, OHIO, ASSIGNOR TO THE SHERIDAN ELECTRIC LIGHT COMPANY, OF NEIV YORK, N. Y.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 259,224, dated June 6, 1882. Application filed January 26, 1882. (No model To all whom it may concern:

Be it known that I, HENRY B. SHERIDAN, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Electric Lamps, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming part of this specification, in

which similar letters of reference indicate corresponding parts in all the figures.

Figure 1, Sheet 1, is a side elevation of my improvement, the base-plate and easing being shown in section through the line x 00, Fig. 2.

1 Fig. 2, Sheet 1, is a plan view of the same, the casing being shown in section through the line y y, Fig. 1. Fig. 3, Sheet 2, is a side elevation,

partly in section, showing my improvement applied to a lamp with carbons meeting in a vertical line. Fig. 4, Sheet 2, is a side elevation, partly in section, showing my improvement applied to a lam p with carbons meeting at an angle.

The object of this invention is to provide an improved regulating mechanism for electric lamps, by means of which a steadier light will be produced than has heretofore been attained, and also by means of which the distance of the are will be posit-ively fixed.

The invention consists in the combination, with the lever, carrying armatures and interposed between low-resis tance electromagnets and high-resistance electro-magnets, and a toothed wheel rigidly connected with a conepulley carrying the carbon-supporting chains,

of a pivoted connecting-bar and a lever i'ulcrumed to a spring and having a fixed pawl, whereby the passage of an electric current through the coils of the low-resistance magnets 0 willsepa'rate thecarbonstoform the voltaicarc;

also, in the combination, with the above-mentioned elements, of a second pivoted connecting-bar and a lever fulcrumed to a spring and having a pivoted pawl, whereby the passage 5 of an electric current through the coils of the high-resistance magnet will move the carbons toward each other after being separated by combustion; and,also,in the combination,with the armature-carrying lever interposed between the low-resistance coils and the highresistance coils, the connecting-bar, and the suspended lever, of a spiral spring and its adjusting-screw, whereby the resistance of the armattire-carrying lever to the action of an electric current passing through the coils of the low-resistance magnet is regulated, as will be hereinafter fully described.

A represents a plate, to which is secured a U-shaped or arched frame, B.

To the upright arms of the frame B, and di rectly opposite each other, are attached the low-resistance magnet-coils C and the high-rcsistance magnet-coils D. The ends of the magnets ot' the coils C and D are concaved upon the arc of a circle to correspond with the are 6 of the curved armatures C D, which are attached at their middle parts to the opposite ends of the slightly-bent balancinglever E. The balancing-lever E is pivoted at its angle to the upper end of the standard F- by a screw, Gr. The lever E is bent to hold the arinatures C D, so that their position relative to their respective magnets and to each other will be such that when one of the armatures is centrally located in respect to the magnetic held of its magnet the other armature will be upon the edge of the magnetic tield of its 'magnet, in position to be acted upon when the power of its magnets preponderates. The lower end of the standard F is attached to the baseplate A.

To the standard F, below the lever E, is pivoted the shaft I, to which is attached the double or cone pulley H and the notched or toothed wheel K, so that the said pulley and wheel will be'rigidly connected.

To the larger part of the cone'pullcy H is attached and around it is wound the chain L, that carries the positive carbon.

To the smaller part of the cone-pulley H is attached and around it is wound in the opposite direction from the chain L the chain L, that carries the negative carbon.

To the arm of the lever E, next the high-resistance magnet-coils D, and at a little the 5 tance from the pivot of said lever, is pivoted the upper end of the connecting-bar M, and to the other arm of the lever E, but at a greater distance from its pivot, is pivoted the upper end of the connecting-bar N.

To the lower end of the connecting-bar M is pivoted the end of a lever, O, which is ful- IOO crumed at its other end to the lower end of a spring, P. The upper end of the spring P is secured to the frame B or to a support attached to the said frame. The lower end of the connecting-bar N is pivoted to the lever Q at a little distance from its. inner end. The outer end of the lever Q is fulcrumed to the lower end of a spring, R, the upper end of which is attached to the frame B or to a support secured to the said frame.

To the inner end of the lever Q is pivoted a pawl, S, which rests against and engages with the teeth of the wheel K,and to the side of the lever 0 is attached, or upon it is formed, a pawl, S, which rests against and engages with the teeth of the wheel K upon the opposite side of the said wheel from the pawl S,as shown in Fig. 1.

The coils of the low-resistance magnet 0 are connected with the positive binding-post V by the wire W and with the holder of the positive carbon by the wire X. The holder of the negative carbon is connected with the negative binding-post V by the wire Y. The coils of the high-resistance magnet D are connected with the positive binding-post V by the wire Z and with the negative binding-post V by the wire to, either directly or by connecting the said wire a with the wire Y. The latter arrangement is shown in Fig. 1. With this construction, when an electric current passes through the coils of the low'resistance magnet O the armature O is attracted in the direction of arrow 1, turning the lever E upon its fulcrum and raising the lever O, which upward movement of the lever 0 causes the pawl S to turn the wheel K in the direction of arrow 3, unwinding the chain L, winding up the chain L, and thus separating thecarbons sufficiently to form the voltaic are. When the carbons become so widely separated by consumption that the electric current cannot pass, then the entire current passing over the coil of the high-resistance magnet D causes the magnet to attract the armature D in the direction of arrow 2, moving the lever E upon its fulcrum and raising the lever Q. The upward movement of the lever Q causes the pawl S to turn the wheel K in the direction of arrow 4. On account of the connecting-bar N being pivoted to the lever E farther from its fulcrum than the connecting-bar M, the pawl S of the lever Q will travel faster than the pawl S of the lever O and cause the wheel K to begin to move before it is released from the pawl S, which is held against the said wheel K by the spring P, and thus acts'as a holding-pawl. The resistance of the lever E to the action of the electric current upon the armature C is regulated by the spiral spring T, the upper end of which is attached to the lever O. The lower end of the spring T is attached to the forward end of the screw U, which passes up through a screw-hole in the base-plate A, so that the tension of the spring T can be regulated by adjusting the screw U. The screw U is secured in place, when adjusted, by ajam-nut, U.

Having thus fully described my invention,I claim as new and desire to secure by Letters Patent- 1. In an electric lamp, the combination, with the lever E, carrying the armatures O D, and interposed between the low-resistance coils 0 and the hi gh-resistance coils D, and the toothedwheel K, rigidly connected with the cone-pulley H, earryin g the carbon-supportin g chains L L, of the pivoted connecting-bar M and the lever O, in crumed to a spring, P, and having a fixed pawl, S, substantially as herein shown and described, whereby the passage of an electric current through the coils of the low-resistance magnet will separate the carbons to form the voltaic are, as set forth. v

2. In an electric lamp, the combination, with the lever E, carrying the armatures G D, and interposed between the low-resistance coils O and the high-resistance coils D, the toothed wheel K, rigidly connected with the cone-pulley H, carrying the carbon-support- M, and the lever O, fulcrumed to the spring I? and having fixed pawl S, of the pivoted connecting-bar N and the lever Q, pivoted to aspring, It, and having a pivoted pawl, S, substantially as herein shown and. described, whereby the passage of an electric current through the coils of the high-resistance magnet will move the carbons toward each other after being separated by combustion, as set forth.

3. In an electric lamp, the combination,with the lever E, carrying the armatures G D, and interposed between the low-resistance magnet O and the high-resistance magnet D, the connecting-bar M, and the lever O, of the spiral spring T and its adj u'stin g-screw U, substantially as herein shown and described, whereby the resistance of the lever to the action of the electric current passing through forth.

4. In an electric lamp, the curved armatures O D and the bent lever E, to which they are attached, in combination with the high and low resistance magnets O D, having concaved ends for operating the arc-regulating mechanism, substantially as specified.

HENRY B. SHERIDAN.

Witnesses:

JAMES T. GRAHAM, C. SEDGWIGK.

ing chains L L, the pivoted connecting-bar the low-resistance coils is regulated, as set 

